Pump piston packing



Man-d1 R6, 1937. I V w. TOWARD 2,@73,888

PUMP PITON PACKING Filed Aug 20, 1955 auu/EN-ro IQ Patented Mar. 16, 1937 uNirEofsTATEs PATENT. OFFICE PUMP PISTON PACKING William Toward, Poland Mines, Pa. Application August 20, 1935, Serial No. 37,048 1 Claim. (01. 309-29) My invention relates to packing, and while as the latter is not grainless and has been proven, primarily intended for pistons of liquid pumping by extensive tests d p e to be susapparatus, it will be obvious that the packing ceptible to fracture, and extremely durable and may be employed in connection with pistons of efficient for pack p p for D p p 5 various types of fluid pumping and compressing The packing ring I consists of two separate, 5 mechanisms wherein it is foundto be applicable. complemental, semi-circular sections, respective- Important objects of the invention are to pro- 1y indicated at 9 and and the p g ring 8 v de a packing of the character described, which consists of similar sections, respectively indicated is constructed of wood, which embodies separate at Hand 12. The pac g rin s d t 10 sections and novel means for maintaining the spacing sleeve 4, with the ring I disposed adja- 10 latter in constant operating engagement with cent to the piston-head 3, and with the ring 8 the wall of the associated cylinder, which is exdisposed adjacent tothe follower 5. The rings tremely durable and highly efficient in its use, have their opposed or adja e ac positioned and economical in its manufacture, installation flatly a a t ac ot e a d are not fi ed y l5 and operation. clamped in place between the piston-head and With the foregoing and other objects in View the follower, as the distance between these latter which will appear as the description proceeds, elements is determined by the length of the inthe invention consists of the novel construction, terDO ed pa Sleeve, and is Such as to Provide combination, and arrangement of parts herein sufficient clearance to allow the free movement specifically described and illustrated in the ac of the packing rings with respect to their concompanying drawing, but it is to be understood nection with the piston structure. that the latter is merely illustrative of an em- Each end of each of the ring sections 9, H], II, bodiment of the invention, and that changes in and I2, is provided with a pocket I3 for the rethe form, proportions, and details of construction ception of an expander [4, which is preferably 5 may be resorted to that come within the scope in the form of a coil spring, as shown inFigure 1, of the claim hereunto appended. or in the form of a rubber plug [5, as illustrated In the drawing wherein like numerals of referin Figure 3. An expander is carried in the ence designate corresponding parts throughout pockets [3 between the contiguous ends of each the several views: associated pair of ring sections, and are of sufli- Figure 1 is a side elevational view, partly in cient power to force the latter outwardly to pro- 30 cross section, of a pump piston embodying the vide the required operative engagement of the present invention. peripheral faces of the packing rings with the Figure 2 is an end view of one of the packing wall of the associated cylinder bore to effect the ring sections, and Figure 3 is an end view, partly most efiicient operation.

5 in cross section, of the assembled packing ring To minimize the possibility of leakage, the sections. packing rings 1 and 8 are arranged so that the Figures 4 and 5 are inner views of packing ring break between the ends of sections 9 and II] will sections. be disposed at right angles relatively to the break Referring in detail to the drawing l denotes a between the ends of the other pair sections ll 4 piston-rod of an ordinary form and construction and I2. To maintain this relative position of including a reduced end portion 2, which latter the rings with respect to each other, a dowel pin extends through the diametric center of a piston- I6 is fixed in the section 9, of the ring I, and head 3 and through a cylindrical spacing sleeve projects into an open slot I! formed in the inner 4 preferably formed integral with the said pisperiphery of the section II of the ring 8. ton-head. The inner edge margin of that face, of the 45 The reduced end portion 2, of the piston-rod ring 1, disposed towards the piston-head 3, and I, further extends through the diametric center the inner edge margin of that face, of the ring 8, of an annular follower 5, which is fitted against disposed towards the follower 5, are recessed, the free end of the spacing sleeve 4 and secured as at Hi, to necessitate machining only the adjain place by a nut 6 engaged on the threaded excent peripheral edge margins of the piston-head 5 tremity of said reduced end portion 2. and follower, respectively, to provide an accurate- My improved piston packing comprises a pair 1y flat and uniform engagement of the rings with of packing rings, respectively indicated at l and the piston-head and follower during the recipro- 8, which may be constructed of any suitable wood cation movement of the piston in the associated .55 material, preferably and particularly gum-wood, cylinder.

To install the packing rings 1 and 8, the nut 6 and follower are removed from the piston rod reduced end portion 2. The ring sections 9 and I0, constituting the ring I, assembled with the expanders l4 between the ends thereof, are forced into the cylinder against the piston-head 3. The ring sections H and I2, constituting the ring 8, are then assembled with their expanders and forced into the cylinder against the installed ring 1 to complete the packing operation after the follower and nut have been replaced. The provision of the open slot I! in the ring section II renders it comparatively easy to locate the dowel pin IS in the ring section 9, as said dowel pin is visible through the slot. The engagement of the dowel pin in said slot assures the proper relative positions of the packing rings 1 and 8 with respect to each other to position the breaks between the ends of the sections of one ring at right angles to the breaks between the ends of the sections of the other ring.

The non-recessed face of the ring 1, and the recessed face of the ring 8, are each preferably formed with two pairs of sockets l9, which are disposed on respective sides of and adjacent to the breaks thereof. Each pair of adjacent sockets are adapted for the engagement by a suitable tool capable of forcing and holding each pair of associated ring sections toward each other against the action of the expanders l4 to facilitate the installation of the packing rings I and 8 into the associated cylinder in the manner set forth.

While the present invention is herein illustrated and described as embodying two packing rings, it is obvious that the number of rings may be varied to best meet conditions found in practice. Further, any other suitable type of expander capable of forcing the ring sections outwardly against the Wall of the cylinder bore may be used instead of the forms thereof, indicated at M and I5.

The present invention provides a most eflicient packing for the pistons of pumps and the like, which will outwear any other types of packing for such purposes now in use, and which may be economically constructed, installed, and replaced.

What I claim is:

In a piston for a pump cylinder, the combination of a pair of packing rings constructed of wood and positioned flatly against each other on said piston, each of said packing rings comprising a pair of separate semi-circular sections, the breaks between the ends of one of said pair of sections being disposed at right angles with respect to the breaks between the ends of the other of said pair of sections, means carried by each of said pair of sections for expanding the latter, means fixed in one of said pair of packing rings and engaging in a slot in the other of said pair of packing rings for maintaining the relative positions of said pair of packing rings on the piston, and means formed in each of said pair of sections engageable to hold the latter in contracted position, the inner edge margin of one face of each of said pair of packing rings being recessed.

WILLIAM TOWARD. 

